Weaving looms with fixed weft bobbins



Oct. 28, 1958 J. MULLER WEAVING LOOMS WITH FIXED WEFT BOBBINS Filed June 25, 1956 United States Patent WEAVING LOOMS WITH FIXED WEFT ROBBINS Jakob Miiller, Frick, Switzerland Application June 25, 1956, Serial No. 593,575 Claims priority, application Switzerland August 12, 1955 4 Claims. (Cl. 139-124) This invention relates to looms with fixed weft bobbins and more particularly to ribbon looms.

In looms of this kind the weft thread drawn off the fixed weft bobbin is introduced by a reciprocating or swinging needle-like member into the corresponding web of warp threads, whereupon the weft thread that is drawn in or picked is secured or interlaced on that side of the warp threads opposite to its side of entry, by means of a catch thread.

It is known in such arrangements to draw the catch thread from a bobbin which is arranged in a catch shuttle, with the latter moving up and down in a direction preferably perpendicular to the plane of the web or material. The picked weft thread is formed into a loop on that side opposite to its side of entry, through which loop passes the shuttle, so that the weft thread is secured and forms a border or selvage on the web at its secured side.

It is evident that such an arrangement for securing the weft threads by means of a shuttle or some other reciprocating member requires a substantial technical outlay. But quite apart from that, the efficiency of the loom using a device of this kind is relatively low, in that the inertia arising from the reciprocating movement of the catch shuttle prevents weaving at a high speed.

The present invention now aims to produce an arrangement in which the above-mentioned disadvantage is overcome. According to the invention, in a loom with a fixed weft bobbin, in which the weft thread drawn into the shed of warp threads is joined by a catch member to a catch thread, the catch member is rotatably driven and bears a bobbin carrying the catch thread and is provided with means for seizing the picked weft thread during its rotation, whereby the weft thread is passed round the bobbin of catch thread and thereby secured to the catch thread.

Other features and advantages of the invention will become apparent from the description now to follow, of a preferred embodiment thereof in which reference will e made to the accompanying drawings. In the latter:

Fig. 1 is a section through the device along the line Il in Figure 2, and

Fig. 2 is a section through the device along the line IIII in Figure 1.

In Figure 1 the warp threads are indicated at A, and run in a known manner from a warp beam or several bobbins over a beating-up reed to the weaving position and the woven web is taken up in a likewise known manner on rollers. These known means are omitted from the draw ings in the interests of simplicity. The warp threads A run through a reed comb arranged before the weaving position and shown diagrammatically at 1. On the picking side of the web B there is arranged a picking member 3 on a vertical driving shaft 2, this member 3 being fixed to the shaft and extending in a substantially horizontal plane, in which plane it performs a swinging movement imparted to it by the shaft 2. In its position shown in full lines the picking member 3 is in its extreme righthand position, as shown in Figure 1, while the indication in broken lines shows its extreme left-hand position. In the first mentioned extreme position the picking member penetrates, as shown, through the warp shed, which is formed in a known manner by heddles (not shown) which are arranged in front of the reed comb 1. The picking member 3 has on the free end of its arcuate operative part a thread eye 4, through which passes the weft thread C. The weft thread C is drawn off a fixed bobbin (not shown) through a thread guide 5. 7

On that side of the web which is opposite the side of entry there is arranged a housing 6, which is attached to the stand of the machine (not shown). The housing 6 contains in its part nearest the free end of the picking member 3 a catch member 7, which is mounted on cylindrical running surfaces 7a and 7b in a horizontal recess in the housing. The catch member 7 has teeth 8 in its recessed outer periphery. It will be seen that the tips of the teeth lie flush with the remainder of the peripheral surface. The teeth 8 and the two running surfaces 7a, 7b have at one point in their periphery a notch 10 which is inclined with respect to a radial line, in a direction opposed to the direction of rotation of the catch member 7. The direction of rotation is indicated by the arrow 11. The catch member 7 is secured against axial movement by two ring-shaped guide plates 12 and 13, which are attached to the walls of the housing. On an axial spindle 14 arranged in the center of the catch member there is a disc 15 on a bearing sleeve 15a by means of which the spindle 14 is freely rotatable with respect to the disc 15.

On the guiding sleeve 15a there is, also freely rotatable, a bobbin 16 carrying the catch thread D. .Right through' which the catch member 7 is arranged, so that consequently the weft thread running through the eye 4 has free access to this catch member and enters into the notch 10, if this is in the appropriate angular position. Into the gap 17 projects a curved guiding member 18 for the catch thread D, which member is attached to the disc 15. The disc 15 has, at the point at which the guiding member 18 projects beyond it, a groove 19 through which the catch thread D passes as it comes off the bobbin 16. The guiding member 18 has in its curved part a thread eye 20 through which the catch thread D passes, and it passes thence along the free end of the guiding member 18 to the woven web B. The guiding member 18 is, as shown in Figure 2, made trough-shaped in section, to guide the catch thread D; at the same time it is preferably arranged inclined to the radial direction.

Two toothed pinions 21 and 22 engaging the teeth 8, having the same number of teeth and are engaged in turn by a common driving gear wheel 23 which is connected by a shaft 24 to the driving motor (not illustrated) of the loom.

On operating the loom the picking member 3 draws the Weft thread C into the warp formed by the threads A, so that the weft thread forms, at the extreme right-hand position of the picking member, an acute angle, of which the apex lies at the eye 4 of which one limb extends to the thread guide 5 and the other to the actual point of weaving on the Web B. The part of the weft thread forming the latter limb thus passes through the gap 17 under the guiding member 18, so that on rotation of the catch member 7 the weft thread C is seized by the notch 10 and taken with it for one complete revolution of the catch member. The path followed by the weft thread after half a revolution of the catch member 7 is shown in Figure 1 in broken lines. When the catch member has performed a complete revolution and the notch 10 has returned nearly to the initial position shown in Figure 2 the weft thread rides up the guiding member 18 and is, as a result of the inclination of the latter, guided out of the notch 10, whereupon the weft thread is drawn out of the gap by the action of -thereturning-picking.member 3, shown inPigure 1 'in 'brokenlines-in its extreme outermost jpos'i'tion. By this picking-up of the weft thread byfth 'e catch member during'a revolution of the latter the weft'thread passesrightlround the catch thread so that the weft thread, .or rather the two wefts drawn into the same warpfby a picking moVement-o fthe member 3, are securedonthe right hand's'ide of the'web by a catch thread to "form a so-called selva-ge on the web.

Whilethe drive to the shaft 2 can he so synchronised with that of the catch member -7 that during one rotation of the "latter the (picking arm "3 performs a complete picking and return cycle, the catch member could complete several revolutions during one complete picking cycle, and'the weft thread would then only'be picked up every second or third revolution. In either case the output o-f-the loom'is not limited by the time of Working of the catching and securing device, and thereby the number of securing motions per unit time can 'be increased as much as isde'sire'd.

v The catch member could, instead of being mounted directly in the housing 6, be mounted in a bush set in the housing, to reduce friction. While the two pinions 21 and '22 provide at each moment a rigid driving connection betweenthe catch member '7 and the driving gear 23, .solthat at'least one of the pinions 21, 22 is always in engagement with the t'eeth'8, it would also 'be possible to transrnit the rotation to the catch member with only one of the wheels '21 or 22. It would also be possible to use more than two idler pinions'll, 22 and to mount the catch member'directly in or on them.

team:

#1. In a weaving loom having a fixed weft bobbin 'carryiiig a w'eft thread and a picking member for drawing the weftthread into the warp; the combination of 'ahousi'ng, a catch member :ro'tatable in said housing 'and carr'yin'g a catch thread bobbin, said catch member including a cylindrical body with gear teeth thereon, said body having a notch opening at the periphery thereof, the bottom of said notch being nearer to the axis of rotation of 'said catchvmember than the'bottoms of spaces defined between said gear teeth, .said notch being adapted to seize the weft thread and entrain the latter during one revolution of'said catch member, said opening of the notch at the periphery of the body having a substantially greater circumferential extent than that of each of said spaces "defined between the gear teeth, and means for rotatably driving said catch member by engagement with at least two of said gear teeth which are spaced apart circumferentially by a distance greater than said circumferential extent of said opening of the notch.

2. In a weaving loom having a fixed weft bobbin carrying a weft thread and a picking member for drawing the weft thread into the warp; the combination as in claim 1, wherein said notch is inclined with respect to a radial line in a direction opposed to the direction of rotation of said catch member, said bottom -of the notch being, with-respect "to the 'direc'tio'n'ofrotation of said catch member, rearwardly outside an angle i'nclude'cl between radial lines extending to the opposite ends of said opening of the notch andb'ein'g substantially in 'ali'gninent'withthe actual point of 'weaving when the weft-thread is initially seized in said notch. p p

3. In a weaving team having a "fixed weft bobbin carrying a weft thread and a picking member for drawing the Weft thread into the warp; the combination as in claim 1, whereinsaid catch member further includes a spindle e'xtending ak'ially within said body, a disc having a relatively rotatable mounting on said spindle and disposed at the side of the catch member facing away from the 'woven web, said catch thr'ead bobbin being rotat'ably mounted on said discso that said disc and catch thread bobbin can be held against rotation during rotation of said spindle with saidbody, and a .-guiding member extending from said disc and leading the catch thread from said catch thread bobbin around said catch member tothe actual point of weaving, said disc being held axially on thespindle by means of said guiding-member under the tension of the catch thread, said guiding member also operating to guide the weft thread after the latter has been passed around the catch thread bobbin by entrainment in said notch.

'4. In a weaving loom having a fixed weft bobbin carrying a weft thread and a picking member for drawing the weft thread into the warpjtlie damnation as in claim l, wherein saidgear teeth are d'fined between spaced apart-recesses which are "axially c'entered 'in'said periphery of the cylindrical b'ody so th'tthe "outer-ends of saidgear teeth are flush with 'c'o'ntin "us tia'nds'of the peripheral surface of the body forming bearings for rotatably supporting said body in said housing, and wherein said means for rotatablydriving the catch member includes at least two spur gears meshing with -said gear teeth on the cylindrical body.

References 'Cited'in th'efile of this patent UNITED STATES PATENTS 

